Sean E. Santry, Director of Software Development with Deitel & Associates, Inc., is a graduate of Boston College, where he studied computer science and philosophy and performed original research on the application of metaphysical systems to object-oriented software design. Through Deitel & Associates, Inc. he has delivered advanced and introductory courses for industry clients including Sun Microsystems, EMC2, Dell, Compaq, Boeing and others. He has contributed to several Deitel publications, including Java How to Program, Fourth Edition; XML How to Program; C++ How to Program, Third Edition; C How to Program, Third Edition; e-Business and e-Commerce How to Program and e-Business and e-Commerce for Managers. Before joining Deitel & Associates, he developed e-business applications with a leading Boston-area consulting firm.